Display shelf



FIG. 1 shows a perspective view of my design for a display shelf showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view. 

The ornamental design for a display shelf, as shown and described. 